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https://issues.apache.org/jira/browse/ARROW-4787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16853410#comment-16853410
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Wes McKinney commented on ARROW-4787:
-------------------------------------
FYI [~fsaintjacques] [~pitrou] -- it is important to be able to compute
analytics for values occurring when hash keys are null, rather than dropping
them
> [C++] Include "null" values (perhaps with an option to toggle on/off) in hash
> kernel actions
> --------------------------------------------------------------------------------------------
>
> Key: ARROW-4787
> URL: https://issues.apache.org/jira/browse/ARROW-4787
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
> Fix For: 0.15.0
>
>
> Null is a meaningful value in the context of analytics. We should have the
> option of considering it distinctly in e.g. {{ValueCounts}}
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